2.1 WBX ... Which motor conversion??

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2.1 WBX ... Which motor conversion??

Postby KINGPRAWN » 14 Apr 2014, 09:21

My 2.1 has had a long term problem with low oil pressure , it's only done about 40k miles and apart from the tragic pressure it's perfect( but just developed an oil leak poss from crank oil seal??) ... Thinking of going to France but I'm not overly confident with a long road trip with the pressure as it is ! Do I just get an exchange motor (on eBay for £1100) or fit something better??
What would be the most cost effective replacement as funds are very tight ... As always
Any suggestions please ???? Thanks guys
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Re: 2.1 WBX ... Which motor conversion??

Postby AdrianC » 14 Apr 2014, 09:28

KINGPRAWN wrote:My 2.1 has had a long term problem with low oil pressure , it's only done about 40k miles and apart from the tragic pressure it's perfect


That's a VERY big "apart from". When you say the engine has 40k miles, since what?

Do you KNOW it's an actual pressure problem, or is it just that the light/BoD is telling you that it is?
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Re: 2.1 WBX ... Which motor conversion??

Postby KINGPRAWN » 14 Apr 2014, 09:55

Sorry... Had a recon motor about 7 yrs ago ( van dosent get used a lot )... I fitted an oil pressure gauge as the fuzzier would sound after about 30mins of fastish driving .. Gauge reads around half what you'd expect across the range when hot( engine never get over 85deg).. But on cold start the gauge reads nearly 5 bar!! Then falls away as she warms up! ... Mobil 10/60 helped to keep it up a bit bin pared to 15/40 ..
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Re: 2.1 WBX ... Which motor conversion??

Postby AdrianC » 14 Apr 2014, 10:07

KINGPRAWN wrote:Sorry... Had a recon motor about 7 yrs ago ( van dosent get used a lot )...


Right. So it's entirely possible that the bottom end has a lot more than 40k on it, and it may not have been particularly well built, either.

10/60 is slightly thinner, cold, than 15/40, but much thicker hot - so if you've still got low pressure with that, then the bottom end's probably none too fresh.
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Re: 2.1 WBX ... Which motor conversion??

Postby KINGPRAWN » 14 Apr 2014, 10:16

So... Do I try to fix my existing ?? Replace with a fresh new ... Or stick summut else in??
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Re: 2.1 WBX ... Which motor conversion??

Postby Syncrobaz » 14 Apr 2014, 10:33

What is the O.P. at 2,000 rpm ? should be between 1-2.5 bar hot.
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Re: 2.1 WBX ... Which motor conversion??

Postby AdrianC » 14 Apr 2014, 10:50

KINGPRAWN wrote:So... Do I try to fix my existing ?? Replace with a fresh new ... Or stick summut else in??


"Fresh new"...? Meaning a "recon"? That's what somebody thought they bought 40k miles ago...
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Re: 2.1 WBX ... Which motor conversion??

Postby covdubber » 14 Apr 2014, 13:10

always less hassle putting a like for like motor back in if on budget, changing to a different type of motor will be more expensive & its unfamiliar to yaself with regards reliabuility

do or get a compression test on ya current motor or leak down test (better) see what the result is, & if it needs a few minor jobs like crank seals possible valves lapped in to create a better seal its less hassle than having to get another motor, if your turns out to be fixable
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Re: 2.1 WBX ... Which motor conversion??

Postby KINGPRAWN » 14 Apr 2014, 14:21

Thanks... Pressure reading I think is half what it should be across the rev range .. When hot 0.5 at idle .. 1bar @2k... 1.5bar@3k.. Etc... But starts on the button, idles sweet, pulls well, goes fast(ish)... Just I can't help feeling like at any time it's all going to let go !!
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Re: 2.1 WBX ... Which motor conversion??

Postby Syncrobaz » 14 Apr 2014, 14:36

That's low, I'm getting 3.5 bar @ 3,000 rpm hot. The 'buzzer of doom' should kick in at 0.7 bar at 2,000 rpm hot.

I've fitted an oil cooler to mine to help preserve my mv for a bit longer!! :wink:
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Re: 2.1 WBX ... Which motor conversion??

Postby KINGPRAWN » 14 Apr 2014, 15:24

Syncrobaz wrote:That's low, I'm getting 3.5 bar @ 3,000 rpm hot. The 'buzzer of doom' should kick in at 0.7 bar at 2,000 rpm hot.

I've fitted an oil cooler to mine to help preserve my mv for a bit longer!! :wink:


I've earthed out my buzzer !!!.... Hence "what to do about it"... It's been like it for 3years now so maybe time is running out. ???
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Re: 2.1 WBX ... Which motor conversion??

Postby AdrianC » 14 Apr 2014, 16:18

KINGPRAWN wrote:It's been like it for 3years now so maybe time is running out. ???


Or, alternatively, why's it going to die next week if it's been like that for 3yrs?
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Re: 2.1 WBX ... Which motor conversion??

Postby silverbullet » 14 Apr 2014, 16:29

A couple of examples:

Axeman's old MV ended up with me (being fully rebuilt for Aidan) Oil pressure was less than exciting - hot or cold - and the stripdown showed that the big ends were showing copper i.e. the whitemetal was worn right through. It was getting ripe to go pop.

I also had a DJ that showed over 50 psi when cranking - never mind running - but on a run down to Devon decided that above 2500rpm would rattle like an old Transhite. Stripdown showed up that #2 (under alternator) had excess dwell at TDC and the big end shell was hammered out, in fact the copper was breaking up! Rod still (reasonably) in-round and crank may also have survived:

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You may not be so lucky.

The problem, I suspect, was that a lot of the "too cheap" rebuilders were re-using big-end bolts and because they are torque-to-yeild or "stretch" bolts, they no longer maintain their clamping pressure on the con-rod cap the second time around, so pressure suffers and bearings don't last. If they were renewed at all.

You can now buy new ones from Classic or Gunzl, they are a fiver each. It's only £40 and cheaper than a crankcase with a big hole in the side.
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Re: 2.1 WBX ... Which motor conversion??

Postby KINGPRAWN » 14 Apr 2014, 18:17

Thanks for your time Mr silver'... So is it worth investigating the problem or putting another in just for piece of mind ??
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Re: 2.1 WBX ... Which motor conversion??

Postby AdrianC » 14 Apr 2014, 18:24

KINGPRAWN wrote:Thanks for your time Mr silver'... So is it worth investigating the problem or putting another in just for piece of mind ??

If you want the van as a keeper, I'd look into getting that engine rebuilt properly, by somebody you trust - and chucking a stop-gap lump in whilst that's happening.
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